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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2017  >  39(6): 812-818
He Chongkang, Cheng Liangbing, Chen Xufeng, Sun Dianxiang, Li Chao, Zhao Guoxi. Effective reservoir identification and “sweet spot” optimization of Chang 7 tight oil reservoir in Xin'anbian oil field, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(6): 812-818. doi: 10.11781/sysydz201706812
Citation: He Chongkang, Cheng Liangbing, Chen Xufeng, Sun Dianxiang, Li Chao, Zhao Guoxi. Effective reservoir identification and “sweet spot” optimization of Chang 7 tight oil reservoir in Xin'anbian oil field, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(6): 812-818. doi: 10.11781/sysydz201706812
shu

Effective reservoir identification and “sweet spot” optimization of Chang 7 tight oil reservoir in Xin'anbian oil field, Ordos Basin

doi: 10.11781/sysydz201706812
  • 1.

    Oil Field Development Office, PetroChina Changqing Oil Field Company, Xi'an, Shaanxi 710018, China

  • 2. Research Institute of Exploration and Development, PetroChina Changqing Oil Field Company, Xi'an, Shaanxi 710018, China

  • 3. National Engineering Laboratory of Low Permeability Oilfield Exploration and Development, Xi'an, Shaanxi 710018, China

  • 4. No.2 Oil Production Plant, PetroChina Changqing Oil Field Company, Xi'an, Shaanxi 710018, China

  • 5. No. 12 Oil Production Plant, PetroChina Changqing Oil Field Company, Xi'an, Shaanxi 710018, China

  • 6. No.6 Oil Production Plant, PetroChina Changqing Oil Field Company, Xi'an, Shaanxi 710018, China

  • Received Date: 2017-01-09
  • Rev Recd Date: 2017-09-13
  • Publish Date: 2017-11-28
    Abstract
  • We proposed criteria whereby tight oil wells can obtain industrial oil flow under the current technical conditions based on the well test results and dynamic production data for Chang 7 tight oil reservoirs in the Xin'anbian oil field of the Ordos Basin. The criteria were established using core observation, petrophysical logging results, reservoir analysis, and well-logging response. We found that the effective fine sandstone formation has porosity greater than 5.5%, and permeability greater than 0.03×10-3 μm2. Mercury injection experiments under constant rate showed that the channel radius is greater than 0.25 μm, the movable fluid saturation is greater than 30%, and the interval acoustic transit time in well logging is larger than 215 μs/m. In the "sweet spot" zone, oil saturation ishigher, and the measured gas value in well cutting logging is 3 times higher than that of the baseline, and the resistivity is greater than 30 Ω·m. The maximum thickness tolerance for a single oil layer in well drilling should be greater than 4 m, and the thickness of multi-layer oil is more than 6 m. In optimization, favorable zones were firstly selected from the sedimentary facies belt, and then the lower limit criteria of reservoir physical properties and layer thickness to make "sweet spot" zone selection. During development, oil saturation and adjacent well performance were considered for reducing the risk of low yield or low efficiency areas. Through the screening analysis of the technical indicators above, the proven oil reserve is up to 100 million tons in the Xin'anbian oil field.

     

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